Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d5dd6933f9c6fd…

MALICIOUS

PDF

88.4 KB Created: 2021-09-09 09:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a828eabac5f70dbddf7605890da813d SHA-1: 52839d8b3dee4503de861dcf5d2a266f1992e02c SHA-256: 18d5dd6933f9c6fd4e0592bf79caee807b51076744a5b913121acd90e7a8edef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs further supports a phishing or spam campaign context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/uplcv?utm_term=mirror+my+phone+to+my+laptop PDF link annotation
    • http://chieusangducphat.com/uploads/userfiles/file/65082419803.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/varudusa.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/lipagorexobunofo.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/kegakiropidanak.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/kupokux.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/bagumejepizezapunip.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210904/files/20210904130615.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/33449725837.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/33440859837.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f88c049cf5---xinarofifome.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/tofezalada.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd65bb2fe---doxedodun.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/75717804752.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/55539804085.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139860cd9d21---bedife.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e24322b0f---lumapesasidokuxu.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161348f7c2b79a---44369984104.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/37657630560.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161349959c12d1---notutumaxesinejagob.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/napogewudef.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d784d33be---9682011180.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/6200056619.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/fizezelerepumimaxi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137504ed1f6e---vinonumo.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/43153104463.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/24649552300.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133d16e474be---xabizowapapugozuwokaroson.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 18488 bytes
SHA-256: 59fdce25b50784aabb7e65b6ed565bcbad07efbab8914fe15ed86d229816b969
font_01_sfnt_off000123e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFE 10456 bytes
SHA-256: b4c99ed2770757e44bb05f790b119b7674442d9b5f48b5da336697b2e6c23b62

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